求助！PREP1-23

forrest0426

23.(29107-!-item-!-188;#058&003854)

From 1978 to 1988, beverage containers accounted for a steadily decreasing percentage of the total weight of household garbage in the United States.The increasingly widespread practice of recycling aluminum and glass was responsible for most of this decline.However, although aluminum recycling was more widely practiced in this period than glass recycling, it was found that the weight of glass bottles in household garbage declined by a greater percentage than the weight of aluminum cans.

Which of the following, if true of the United States in the period 1978 to 1988, most helps to account for the finding?

(A) Glass bottles are significantly heavier than aluminum cans of comparable size.

(B) Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled glass bottles had contained products other than beverages.

(C) Manufacturers replaced many glass bottles, but few aluminum cans, with plastic containers.

(D) The total weight of glass bottles purchased by households increased at a slightly faster rate than the total weight of aluminum cans.

(E) In many areas, glass bottles had to be sorted by color of the glass before being recycled, whereas aluminum cans required no sorting.


为什么A不对啊？A不也可以解释最后一句吗？谢谢谢谢了！！！！

forrest0426

顶一下啊！

homefu

答案应该是C吧。
要解释的矛盾是：aluminum recycling 比glass recycling更多，但是in household garbage ，weight of glass bottles 数量更少

A.这个glass的更重对recycling没有影响，文中没有说recycling的效率是根据weight的重量多少来说的
C.说明了weight of glass bottles 为什么少了

forrest0426

呵呵，谢谢了！明白了！

drummer

赞ls签名档，纪念一下该时刻，正在强攻prep - CR, 看这道题，今天要全部一口气做完啊，压力大了

G不上7不改名

在我理解上，这一点其实是有点绕的，想了好多种解法，感觉他这里所说的recycle应该是指数量，而A中说glass质量是比al多的，并不能导出数量是什么样的
  for example, glass 减少10， al减少5
             假设一个glass 2， 一个al 1并不能证明widely practiced
             假设一个glass 3， 一个al 2 甚至可以说recycle上al不如glass，与原文相矛盾